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Overexpression of PSK-? in Arabidopsis promotes growth without influencing pattern-triggered immunity.

ABSTRACT: Phytosulfokine-? (PSK-?) is a disulfated pentapeptide with the sequence YIYTQ. As a new peptide hormone, PSK-? promotes plant growth and development but represses pattern-triggered immunity (PTI) against bacterial pathogens. Our recent study identified a novel phytosulfokine, PSK-?, from soybean. The sequence of PSK-? is YVYTQ in which the tyrosines are sulfated. Expression of PSK-? significantly increased seed size and weight in transgenic plants by inducing embryo cell expansion. In this study, we further found that the constitutive expression of PSK-? in Arabidopsis promotes the growth of vegetative organs as well as seeds. Moreover, overexpressed PSK-? does not influence plant PTI against bacterial pathogens. These findings demonstrate a potential use of PSK-? in genetic improvement of crop growth and yield by molecular breeding.

SUBMITTER: Liu Y

PROVIDER: S-EPMC6866693 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Overexpression of PSK-γ in Arabidopsis promotes growth without influencing pattern-triggered immunity.

Liu Yumin Y Zhang Danping D Li Mei M Yan Junhui J Luo Li L Yu Liangliang L

Plant signaling & behavior 20191031 12

Phytosulfokine-α (PSK-α) is a disulfated pentapeptide with the sequence YIYTQ. As a new peptide hormone, PSK-α promotes plant growth and development but represses pattern-triggered immunity (PTI) against bacterial pathogens. Our recent study identified a novel phytosulfokine, PSK-γ, from soybean. The sequence of PSK-γ is YVYTQ in which the tyrosines are sulfated. Expression of PSK-γ significantly increased seed size and weight in transgenic plants by inducing embryo cell expansion. In this study ...[more]

PMID: 31668114

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